Redi Cube and Fadi Cube are both twisty puzzles, like the Rubik's Cube. Here, the pieces turn around the cube corners. These puzzles are an attempt to use other than conventional slices to make a twisty puzzle. At first sight, it looks impossible to twist this puzzle at all. But the pieces go over and under eachother to make it possible.

All of the puzzles like these that I keep seeing on Shapeways never stop amazing me. I understand the mechanics of a Rubik's Cube, but each time a new puzzle comes up on here I stare at it wondering how in the world it could possibly work.
Nice work on both puzzles. Are the colors painted on or are they stickers? And have you experimented with scrambling and solving them yet?
I'd be interested to know how difficult they are in comparison to a traditional Rubik's Cube.I have a few friends who can solve them pretty quickly, so I might be interested in some of these new designs as gifts to keep them busy for a while.

> Are the colors painted on or are they stickers?
These are stickers. I order all my stickers from Dragan "Dr. Sticker" Tutic. He offers high quality custom-made stickers for a very attractive price.http://www.dr-sticker.com/about---contact.php

> And have you experimented with scrambling and solving them yet?
Eh, ..., so far I have only scrambled them, taken apart and reassembled.

> how difficult they are in comparison to a traditional Rubik's Cube
Some of them are much harder, some are easier. What is important is that they all are very different from a traditional Rubik's. So your friends will be baffled, as they can't use any of the moves they learned for their Rubik's Cube.

Instead of using stickers, have you considering making a slot into each face, allowing a small square to be slotted into place? Then you could paint the squares separately with acrylic to achieve the same solid color, then slot it into place. It's alot more crafty and elegant then stickers. And by keeping each piece separate well painting, you don't have to put in alot of careful brush work. You could even use metallic or iridescent spray paints to give each square a nifty finish stickers can't match.

Alternatively, another idea might be to forgo the traditional simple colors and instead emboss the sides of the cube with famous paintings, faces, or some other kind of simple and recognizable picture. That way, instead of just colors, each face could be a work of art on to itself.

For example:

If you were making just a regular Rubix Cube, make a thin square box with a few thousand faces and use a function like 3D Studio's Displace to extrude the box. Then carefully divide the box into 9 even pieces, shrink a bit so there's a gap between each piece, and affix each piece to the face of one of Cube elements.